Research on the Non-metallic Inclusion in 20CrMnTi Steel During the Process of Refining and Casting

Li Junguo; Ceng Yanan; Wang Shuhua; Li Shouzhang

Volume 31 Issue 1

Jan. 2010

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Li Junguo, Ceng Yanan, Wang Shuhua, Li Shouzhang. Research on the Non-metallic Inclusion in 20CrMnTi Steel During the Process of Refining and Casting[J]. IRON STEEL VANADIUM TITANIUM, 2010, 31(1): 56-61.

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Li Junguo, Ceng Yanan, Wang Shuhua, Li Shouzhang. Research on the Non-metallic Inclusion in 20CrMnTi Steel During the Process of Refining and Casting[J]. IRON STEEL VANADIUM TITANIUM, 2010, 31(1): 56-61.

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Research on the Non-metallic Inclusion in 20CrMnTi Steel During the Process of Refining and Casting

School of Metallurgy and Energy, Hebei Polytechnic University, Tangshan 063009, Hebei, China

Received Date: 2009-11-26

Abstract

Abstract

Use the methods of metallographic observation, sample-electrolysing, SEM and EPMA, the quantity, dimension, morphologies and composition of non-metallic inclusions in 20CrMnTi steel were investigated.It was suggested that lots of non-metallic inclusions were removed from molten steel during LF refining.The T[O] and [N] contents in slab were 18.53×10^-6 and 46.94×10^-6, respectively, as some air could be inhaled into molten steel.The volume ratio of micro-inclusion in slab was being from 0.085% to 0.11%.The micro-inclusions in molten steel and slab, which were typical production during deoxidization and desulfurization, were comprised with oxide, sulfide, calcium silicates and calcium aluminates inclusions.The quantity of large-scale inclusions in molten steel in tundish and slab were 1.011 mg/kg and 0.785 mg/kg.These typical complex inclusions were silicates and silicate aluminates with higher contents of K₂O and Na₂O, which were the main components in mold powder.
- gear steel,
- 20CrMnTi,
- re-oxidation,
- sample-electrolysing,
- non-metallic inclusion,
- volume ratio

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